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Synthetic Gem Materials and Simulants in the 1990s

John I. Koivula, Maha Tannous, December 1, 2000

The 1990s witnessed important developments in the commercial viability of gem-quality synthetic diamonds.

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A Simple Approach to Detecting Diamond Simulants

Jill Hobbs, March 1, 1981

Contrasting the physical properties of diamond with colourless specimens to identify the most problematic diamond simulants.

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This 1.04 ct black submetallic round brilliant, initially represented as diamond, was identified as boron carbide. Photo by G. Choudhary.
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Boron Carbide: A New Imitation Black Diamond

Gagan Choudhary, September 13, 2013

Specimen sold as black diamond identified as ceramic material commonly used in hard-plating applications

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The internal structures of natural pearls from the marine mollusk Pinctada maxima are the subject of the lead article in this issue. The scattered loose pearls on the cover are from Paspaley’s natural pearl collection, which includes one discovered in the 1970s at the Eighty Mile Beach fishing grounds
G&G Spring 2021 Edition
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